http://learnenglishkids.britishcouncil.org/en/grammar-practice/nouns-countable-and-uncountable
https://www.grammar.cl/Games/Some_Any_A_An.htm
http://www.bradleys-english-school.com/online/flashmultiplechoice/mc_aansomeany.html
https://www.eslgamesplus.com/some-any-moonshot/